Malicious PDF — malware analysis report

Static analysis result for SHA-256 457f3d1ff8601b12…

MALICIOUS

PDF

76.9 KB Created: 2021-04-05 12:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3a1690324e5d21ec882010a2b628a94f SHA-1: 7ea191c4ea7ad469d983022a9f7ff35837fd1b57 SHA-256: 457f3d1ff8601b12d71972bacb7ed0cd9339c729322cad3ef2bb1f14e8fd6390
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://midufefew.ru/strik?utm_term=weird+scenes+inside+laurel+canyon+pdf PDF link annotation
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://titalat.iblogger.org/jigonipuporumipojaberubu.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/seketeks5o56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e599201-9143-4a93-a158-4487663b8b10/magic_tree_house_book_1.pdfIn PDF document text
    • https://ab0007c4-58ca-4db2-ab23-686bae4d53c1.filesusr.com/ugd/8bf248_42ce6a13a131426a8bd1ae2d729fb126.pdf?index=trueIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_b1907c42abde4798874d595a1d0d2b24.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d08cc40-1ed6-4f9f-828b-cb541a75ca8c/what_causes_violence_in_the_media.pdfIn PDF document text
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_67d78aa2711545c8aa601000bace9469.pdf?index=trueIn PDF document text
    • https://677e6977-fc43-48b2-ac81-16e478c8573b.filesusr.com/ugd/3750c2_7e0afd03e5aa4d60be15cd6c5314a4d7.pdf?index=trueIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_fb4e874e38064b0dbe90fab9bc889b21.pdf?index=trueIn PDF document text
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_20f7cb0637314fcc9f7d10cd7bed48f7.pdf?index=trueIn PDF document text
    • http://sejabodareluf.epizy.com/iomega_ix2_firmware_update.pdfIn PDF document text
    • https://16cc4848-9a85-487f-bc1d-da55f68f8448.filesusr.com/ugd/dcf86b_fddf8e53b8cb4bfe893404b17ee42c1b.pdf?index=trueIn PDF document text
    • http://wizuxamop.rf.gd/messenger_pc_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cac3269-6e9e-4845-9683-de316bd3e42c/panotour_pro_2.5_14_crack.pdfIn PDF document text
    • https://ef90beaa-bca2-431e-862c-49c19dd94618.filesusr.com/ugd/06497e_47cc30e48de34b24897d6f3e7adf1084.pdf?index=trueIn PDF document text
    • https://5090cb7a-f7dd-45b7-a4a3-960150b62b23.filesusr.com/ugd/dfd4af_6dac0482096c465e938c1a89a03fecc2.pdf?index=trueIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_bddaeadfdc544007af5463487a69964d.pdf?index=trueIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_21ef7471a15d4820a794a5b4611a1fb4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/58fe65ad-d1da-4496-9f74-1db6301af35e/what_are_management_control_systems.pdfIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_e6717d0c7757451a97fa0584bd2634a5.pdf?index=trueIn PDF document text
    • http://piterar.epizy.com/jepugi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 5264 bytes
SHA-256: 03b92b39fee3639f8189aead37c4a93b04edbbf6ea7f492fb587491b1d5b03fa
font_01_sfnt_off0000fec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 10840 bytes
SHA-256: 813160834def44378aaf94fdd4e4396f35ff8ce99d8b988b644e5c9954b595e5